A056397 Number of step shifted (decimated) sequence structures using exactly three different symbols.

0, 0, 1, 4, 8, 50, 54, 284, 525, 2370, 2872, 22748, 21866, 131750, 298792, 904918, 1341518, 10745090, 10748218, 72889084, 145274556, 522819590, 713023210, 5892634240, 7059926605, 35300985550, 70604008204

Offset

1,4

Comments

See A056371 for an explanation of step shifts. Permuting the symbols will not change the structure.

References

M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia. [See A056391 for pdf file of Chap. 2]

Links

Table of n, a(n) for n=1..27.

Formula

A056392(n)-A056391(n).

Crossrefs

Column 3 of A288620.

Cf. A056377.

Sequence in context: A267987 A056407 A329942 * A369074 A189314 A358791

Adjacent sequences: A056394 A056395 A056396 * A056398 A056399 A056400

Keyword

nonn

Author

Marks R. Nester

Status

approved